Finding the Fourth Proportional to 12,087.72, 16,680.06 and 6,781.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.72 : 16,680.06 = 6,781.50 : x
2. Step 2: Convert to fraction form
   12,087.72/16,680.06 = 6,781.50/x
3. Step 3: Cross multiply
   12,087.72x = 16,680.06 × 6,781.50
4. Step 4: Simplify right side
   12,087.72x = 113,115,826.89
5. Step 5: Solve for x
   x = 113,115,826.89/12,087.72
6. Step 6: Final answer
   x = 9,357.91